YouTube description:
Conceived in the open sea, tiny spaceship-shaped sea urchin larvae search the vast ocean to find a home. After this incredible odyssey, they undergo one of the most remarkable transformations... continue reading

UPDATE: We're still working on a species ID with our science partners at the Harvard Museum of Comparative Zoology, but currently we're thinking the purple orb is a pleurobranch, a nudibranch relative.... continue reading